An online buddy of mine that has similar interest in found object mosaics shared this cool site. I’ve not joined the site or even played on it yet, but thought the site was cool enough to share since I’ve never ran across it before. 
https://www.openprocessing.org/
Some examples he shared with me:
edit: Just found out that I actually have ran across it (thanks RobA at GIMPChat) back in 2013. lol
Who really remembers what you’ve done online even yesterday. 